Reasonable cause

(3) Reasonable cause - (i) For purposes of section 6038(b) and (c) and this section, the time prescribed for furnishing information under paragraph (b) of this section, and the beginning of the 90-day period after mailing of notice by the director under paragraph (c)(2) of this section, shall be treated as being not earlier than the last day on which reasonable cause existed for failure to furnish the information.